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"light amplification by stimulated emission of radiation" =P

Also, I included a link to the wikipedia article on them.

Basically they produce light that is a single color. So if it is a blue laser, it makes a blue light, that is one one single wavelengths, lots of pieces of light that are all the exact same blue, and nothing else.

oh, I get it now. Light is weird.

Yes, exactly.

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